When this question was asked on Qi a contestant (musician) replied "mustard gas" and was (wrongly) ridiculed for giving it. The muso was almost correct: there is a chemical weapon (poison gas) called Lewisite which smells of geraniums, and has been used with mustard gas ...

Quote

Lewisite is a chemical compound from a chemical family called arsines. While it is colorless and odorless when pure, Lewisite is usually found as an oily, yellow or brown liquid with a distinct odor that has been described as similar to geraniums. It is a chemical weapon, acting as a vesicant (blister agent) and lung irritant, and can be used in combination with mustard gas as mustard-lewisite.

When this question was asked on Qi a contestant (musician) replied "mustard gas" and was (wrongly) ridiculed for giving it. The muso was almost correct: there is a chemical weapon (poison gas) called Lewisite which smells of geraniums, and has been used with mustard gas ...

Quote

Lewisite is a chemical compound from a chemical family called arsines. While it is colorless and odorless when pure, Lewisite is usually found as an oily, yellow or brown liquid with a distinct odor that has been described as similar to geraniums. It is a chemical weapon, acting as a vesicant (blister agent) and lung irritant, and can be used in combination with mustard gas as mustard-lewisite.

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